Quick question on hydraulics

JBex

New User
Ok, so I got my loader frame on this weekend and I'm trying to get my parts list together for hooking up the trip bucket loader. First question, what size are the ports on the hydraulic control valve. I've been reading 1/4 NPT, but my dad swears it's 3/8. Second, my plan is to follow the example of others on the forum and install a 3 way valve to isolate the loader and rear lift arms. Which port do I use going from the hydraulic control to the 3 way valve? Right, or left rear? I've been reading that only one side of the pump actually holds position. I currently have the pump correctly set up for hold position and have no problems, but after reading it sounds like only 1 of the rams actually locks the arms into position. Any help to clear up these questions is greatly appreciated.
 
Wow, for the non mind readers out there, this is for WD45. I completely forgot that in the first question. Thanks again
 
The hold control valve, on top of the hyd. pump, is where the three outlet ports are. They are 1/4" NPT. If memory serves correctly, the two ports across from one another both "hold" in hold position.
 
IIRC the hyd lift ram hoses attach to the right side port and the forward port, left side. The remote valve or loader cyls would attach to the rear port, left side. If left rear port and right side are opposite each other, wouldn"t that provide "hold" for either usage?
 
From owners manual. "When a ram is used in connection with hold position the ram hose must be attached to one of the foward holes closest to screw "C"."

Seems to me it can be plumbed for just one or both of the rams to hold.
 
If I understand it the rams need to be in one of the foward holes to be used for hold function.
 
I just went out and looked to refresh my memory! The two forward holes are the ones across from one another. The left rear port, without the hold function, was originally hooked to the left lift cyl. Then that cyl. would be swung forward to operate the front cultivator. This set up allowed for the sequential LOWERING of the front vs rear cultivators. The "delayed LIFT" was more a function of the pump settings, as opposed to the hold control valve settings.
The remote line was hooked to the left front port, giving it full hold control for trailed implements.
Therefore, when hooked up the "factory" way, when using hold control on the lift arms, both cylinders lifted, but only the right one held when the hand lever was set for hold! This was not a problem for most implements. But with a heavy mounted implement, you can get a little flexing of the rockshaft, and a little drooping of the left side, when going to hold position.
Original loader hook up was a tee plumbed in below the street ell on the right side, just inside the frame rail. So the lift arms were forced full up when using loader.
None of this of course restricts anyone from hooking it up any way they want! I switched the left side cyl./remote lines to get full hold control on both rockshaft cylinders to hold up a heavy bush hog. I don't need hold on the remote.
 
That is a nominal 3/8" pipe thread.
I ran a line from the LF port on the hold valve to the inlet side of my diverter valve.
I plugged the other two ports on the hold valve.
In my case I teed the front outlet port on my diverter valve to the front end loader cylinders and teed the back diverter port to the rocker shaft rams.
When in the forward position, the loader works as normal and the rockershaft stays where it is at the moment the valve is activated.
The exact opposite happens when I move the diverter valve to the rear position.
In either position, the original control lever operates as it normally would.
 
Thanks for all the help. Sounds like I'll use the right side port on the hold control valve then. That way I won't have to mess with the remote. The drooping on the left cylinder explains why I have a hard time getting enough tilt on my straight blade when I'm working the road from the right side.

I'm still a little confused on the size of the fitting though. Basically I need to know if I walk into the local farm supply, am I looking for 1/4 or 3/8 fittings and hoses. Or is 3/8 nominal the same as 1/4 NPT. Thanks again
 
Thanks for the clarification, now it's off to buy a pile of parts! I'm sure I'll be back with more questions. This 60 year old tractor continues to surprise me. Quite a piece of engineering.
 

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